These bright-orange plugs from Chamber-View come in three models for shotguns, rifles, and handguns.
The Question: Can the plug withstand the temperatures generated by a hot rifle chamber? Some empty-chamber indicators can melt, creating a hard-to-clean mess in the action.
The Test: I put 120 rounds—four 30-round mags—through my PWS MK118 in the course of a couple of minutes while doing some rapid-fire target transition drills at my range. The rifle was blazing hot when I dumped the fourth mag. I accidentally burned my thumb on the gas block, confirming the rifle’s volcanic disposition. I popped the plug into the chamber, laid the rifle on the ground, and snapped the picture above.
The Result: I kept the plug in the chamber for 45 minutes. When I got back to my workshop, I pulled it out and everything was fine. The Chamber-View passed with full marks.